Corporation is trying to improve its inventory control system and has installed an online system at its retail stores. Fisk anticipates sales of $40,500$ units per year, an ordering cost of $$4$ per order, and carrying costs of $$1\mathrm{.}6$ per unit. $-10$ marksa$)$ What is the economic ordering quantity? $-4$ marksb$)$ How many orders will be placed during the year? $-2$ marksc$)$ What will the average inventory be$?-2$ marksd$)$ What is the total cost of inventory expected